There is no homework, but now there is so much classwork you get home at 10.

I wish it was earlier in the day.

wish granted but since there is no description of which day - you were sent to the early days when earth was forming where you could not survive.

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i wish for a delicious pizza to eat which won't cause me any harm directly or indirectly.

delicious.....and VERY spicy so spicy that you never eat the pizza again.

i wish for a giganic car and the nearest tire were on top of my neighboring house`s roof.

Granted, nothing goes wrong except for the moral implications obtained from killing your neighbor. 

I wish for the next user to find the least harmful way to corrupt my wish; which happens to be for a doughnut.

you get the doughnut, you just don't eat it. simple enough.

I wish for a new phone that is just as indestructible as the nokia.

then you lost it

i wish for an 1kg grain of sand (i need glass)

It appears inside your lungs and you choke to death on it.

I wish for some CHICKEN! YEAH!

wish granted but the chicken was so enormous that it "ate" you.

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i wish to be a god.

the gods summoned you to become one, but then you got kicked out.

I wish to be incarcerated.

Unfortunately, it is the year 1500, and you get incarcerated, and then tortured to death by the Spanish Inquisition.

I wish for some heavy water.